Mule HTTP java.io.IOException: Attempted read on closed stream - httpclient

Question

When I used two HTTP endpoints in a flow, Mule throws this exception. I've found the way to deal with this problem: use the second HTTP endpoint in asynchronous mode, but it is not a good way.
ERROR DefaultSystemExceptionStrategy [[testdemo].connector.http.mule.default.receiver.03]: Caught exception in Exception Strategy: Attempted read on closed stream.
java.io.IOException: Attempted read on closed stream.
at org.apache.commons.httpclient.AutoCloseInputStream.isReadAllowed(AutoCloseInputStream.java:183)
at org.apache.commons.httpclient.AutoCloseInputStream.read(AutoCloseInputStream.java:126)
at org.mule.model.streaming.DelegatingInputStream.read(DelegatingInputStream.java:58)
at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1025)
at org.mule.transformer.simple.ObjectToOutputHandler$3.write(ObjectToOutputHandler.java:76)
at org.mule.transport.http.HttpServerConnection.writeResponse(HttpServerConnection.java:315)
at org.mule.transport.http.HttpMessageReceiver$HttpWorker.run(HttpMessageReceiver.java:164)
at org.mule.work.WorkerContext.run(WorkerContext.java:311)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
my code :
<flow doc:name="httpPost" name="httpPost">
<http:inbound-endpoint doc:name="HTTP" keep-alive="true"
exchange-pattern="request-response" host="localhost" path="service"
port="8082" />
<http:body-to-parameter-map-transformer />
<!-- This component is just set to show the message accecpted from the request -->
<scripting:component>
<scripting:script engine="groovy">
println payload['name']
return payload['name']+'123'
</scripting:script>
</scripting:component>
</flow>
<flow doc:name="httpPost" name="client">
<http:inbound-endpoint doc:name="HTTP" name="httpClient"
exchange-pattern="request-response" host="localhost" path="client"
port="8082" encoding="UTF-8" />
<http:body-to-parameter-map-transformer />
<scripting:component>
<scripting:script engine="groovy">
payload['name'] = 'opasso'
def paramstr = ""
for( param in payload){
paramstr = paramstr + "&" + param.key+ "=" + param.value
}
println "querystr:$paramstr"
return paramstr.substring(1)
</scripting:script>
</scripting:component>
<http:outbound-endpoint address="http://localhost:8082/service"
exchange-pattern="request-response" contentType="application/x-www-form-urlencoded"
method="POST" encoding="UTF-8" />
<!-- This component is just set to show the message accecpted from the request -->
<scripting:component>
<scripting:script engine="groovy">
def msg = "return payload:$payload;".toString()
println msg
return payload
</scripting:script>
</scripting:component>
</flow>

Answer 1

The problem is related to the funky business you're doing in the scripting:component with the streaming message payload generated by the http:outbound-endpoint. The script probably consumes the input stream, leaving it in a state where it can't used anymore.
Try adding a <object-to-string-transformer /> right after the http:outbound-endpoint to deserialize the stream into a string so the payload can be used both in the scripting:component and by Mule.